8.2L Detroit Fuel Pincher: Diesel Flooding the Oil - What's Causing It?

Added: 2026-05-30

[00:00:17]Hey there, welcome back to Farm Craft.

[00:00:19]I'm John. This is my dump truck. This is a 1986 GMC C7000. And this is a pretty good truck. There's also a lot wrong with it. In all honesty, it probably wasn't the best purchase that I've ever made. Uh mainly because of the engine that was in it. It has the infamous Detroit 8.2 L diesel fuel pincher, they call it. And it's just not a very well-designed engine. It's difficult to work on as far as the injectors and the fuel system. And it's not known for being very reliable. But the reality is, I'm kind of limping this thing along and it's living on borrowed time. And I want to keep it going as long as I can because it's an excellent farm truck. It is really nice just to be able to move a bunch of firewood from over there to here or dirt or whatever it is that I'm moving around the farm. Uh I try not to take it on the on the roads and haul full loads of stone, that kind of stuff, very often. It can haul 15 tons. But boy, that engine struggles to do it and you feel like it's going to blow up at any moment.

[00:01:13]>> [laughter] >> Anyway, the problem that I want to address today is an important one for this engine. If it's going to last any longer, I've got to fix this. Let me show you what's going on.

[00:01:25]Yeah, I feel kind of bad bashing her. I have to say, this engine starts every time. It starts right up. It doesn't matter if it's cold, if it's hot, it runs. Uh it does smoke quite a bit when it first starts up, but then it'll calm down after a few minutes once it warms up.

[00:01:41]Um I had to do a little work on the pulleys. Uh that repair's been fine. The cooling system's fine. See the antifreeze there.

[00:01:49]So, there are definitely good things to say about it.

[00:01:58]Here's the problem.

[00:02:00]See how high the oil is on the stick?

[00:02:03]She's making oil.

[00:02:07]There, I hope you can see the oil's up to there.

[00:02:10]The full mark is there.

[00:02:13]That is a lot of extra oil.

[00:02:15]And it's quite thin.

[00:02:19]Yeah, that definitely smells like diesel fuel.

[00:02:22]That is a problem.

[00:02:23]So, I can tell you when I first got this truck, I changed the oil and I haven't I mean, I've had it for a while, but really mileage-wise, I haven't driven it that much distance. Hours run, it I don't know. I have no idea, but it not that much. Not enough to need another oil change just based on mileage or hours.

[00:02:41]But, uh that oil is so thin that the engine is basically being lubricated with diesel fuel at this point. Not only that, I put some of that really thick smoke treatment stuff in there at one point, which would have thickened the oil up. That's how that works. And it's still that thin. Obviously, it's going to need new oil, but I got to figure out where that oil is coming from. There are two primary sources on this and one is going to be the fuel pump.

[00:03:06]The other is going to be the injectors.

[00:03:08]My understanding with this engine, uh it's infamous for the injectors. You need special tools. You need a lot of know-how that most mechanics don't know anymore. I certainly don't. Uh because no one's working on these things anymore. Uh so, the injectors are something I would really like to stay away from. I think it's most likely the fuel pump. My understanding is there's a diaphragm in there and it's operating off of crankcase pressure. So, if the diaphragm breaks, tears, whatever, then fuel gets right through the diaphragm right down into the crankcase. And I think that's what the problem is.

[00:03:41]Yes, and a stuck injector that's spitting too much fuel can wash down the cylinder walls and end up in your crankcase. Obviously, that does happen, but the quantity and the speed with which this happens, I think it's got to be the fuel pump, at least in part. So, that's what I'm going to tackle today.

[00:03:57]I'm kind of hoping we're going to get in there and we're going to be able to tear the old fuel pump apart and find the smoking gun. So, you might think to yourself, "Ah, big deal. Just change out the fuel pump."

[00:04:07]Well, it's not going to be that easy.

[00:04:11]Uh, I'm already hitting my head on things. There's not a lot of room in here.

[00:04:15]And it is way down in there. I can't even touch it. Yeah, it's it's that thing right [snorts] there, underneath this guy.

[00:04:24]This is the governor. And underneath This is the airbox. So, we'll see how it goes. I don't know how much I'm going to have to take apart in order to do this.

[00:04:33]Uh, these are the lines coming from the fuel tank. I'm pretty sure the big one is the supply and the return is smaller.

[00:04:39]So, this is the suction line going to the fuel pump. And that pump just makes like a 65 PSI fuel pressure. It's not a high-pressure pump.

[00:04:49]Uh, and there is a fuel rail that then goes to the injectors. And the injectors, I believe, are mechanical.

[00:04:55]The injectors are basically high-pressure pumps being actuated by push rods. That's the part I'm not going to get into unless I absolutely have to.

[00:05:03]Uh, I just don't really want to go there. So, yeah, then after coming to cuz there's two heads on this thing.

[00:05:08]After coming to the heads, uh, the return lines are these little lines here.

[00:05:14]And there's another one.

[00:05:16]Gosh, I can't even get my head in there to see. This is going to be fun.

[00:05:21]Uh, and then they go back to the tank.

[00:05:23]Don't know if I explained that well at all, but uh, that's what you get.

[00:05:51]>> All right. So, there's the pump underneath this, which is the governor.

[00:05:56]But, that does not look like that's going to come apart easily.

[00:05:59]And it's something that would need to be sealed up again after I do it. So, I'm going to avoid that. I think I can get it out of there, but it is filthy down there. So, first let me see if I can clean it up a little bit.

[00:06:19]Brake cleaner.

[00:06:38]This is why I don't like working on cars so much is there's always just stuff in the way.

[00:06:43]You always know what you need to do, and what you need to do wouldn't be that hard if you could just get to it.

[00:06:49]And I just find that frustrating.

[00:06:51]On Marge, you could pretty much get to everything for the most part, way better than a car.

[00:06:58]Yeah, way better than a skid steer.

[00:07:00]Those are tough, too.

[00:07:07]It's a good thing that doesn't hurt.

[00:07:10]Hey.

[00:07:12]All right.

[00:07:13]That one is off.

[00:07:15]Surely that will allow it to come off.

[00:07:22]Might not.

[00:07:24]Might have to get that one.

[00:08:06]>> I'm going to get it moved.

[00:08:22]I just realized even if I get this thing unbolted, there's not going to be room to get it out of there.

[00:08:27]What is that?

[00:08:33]This thing right above it is the governor and it needs to be adjusted just perfectly and I don't want to mess with that if I can avoid it because it can make the engine run wrong and even make it run away.

[00:08:50]These are just breather hoses to the valve covers.

[00:09:00]I'm not getting that out of the way, not easily, but at least it'll move a little bit.

[00:09:12]All right, getting you guys where you can see is a trick.

[00:09:15]I think you can see that bolt right there.

[00:09:18]That's going to be the easiest of the three and it just comes right loose.

[00:09:24]There's another one down here.

[00:09:29]Boy, getting this thing back together is going to be something.

[00:09:37]All right, that one's loose.

[00:09:39]Let's try the third one.

[00:09:45]If I can get them all loose, they're well on the way.

[00:09:49]I can't really see what I'm doing here.

[00:09:53]Moved.

[00:10:03]Ah.

[00:10:05]Of course it's not going to ratchet.

[00:10:12]That's excellent.

[00:10:13]>> [sighs] >> Yeah.

[00:10:17]I do have my fingers on it and it is spinning, so there's that.

[00:10:22]>> [snorts] [clears throat] >> Check that out.

[00:10:32]That is one of three.

[00:10:35]See about this side.

[00:10:42]Now this one's ratcheting. That's a lot easier.

[00:10:46]Shouldn't have said that.

[00:10:52]And it just quit ratcheting.

[00:10:55]All right.

[00:10:57]Can I get in there?

[00:10:59]Not really.

[00:11:08]Come on, baby.

[00:11:15]I guess all that's going to do.

[00:11:17]Unless it moves. Maybe if it moves.

[00:11:25]Jam your hand in there until it really hurts.

[00:11:28]>> [clears throat] >> And you know you're in the right spot.

[00:11:35]And they had to make these bolts extra long.

[00:11:39]Cuz why wouldn't they?

[00:11:41]Two.

[00:11:43]It's just this third one on this side that you can't see. It is ratcheting again.

[00:11:54]Now. No, it didn't come out. It quit ratcheting.

[00:12:03]Trying to get myself in a position where my hand can actually do something. I can't [snorts] get it from this side.

[00:12:11]Man, oh man.

[00:12:13]So, I think I'm going to have to take these off cuz the pump the bolts are holding it this way and it needs to move this way, but those fuel lines See, this line goes and wraps around and then goes into there.

[00:12:31]And it's basically not letting the pump move. So, I think if I can get these out of the way these are going to have to go on the new pump anyway.

[00:12:40]I think this will do the trick.

[00:12:43]>> [laughter] >> Nope.

[00:12:59]How is that? Spins so easy with that wrench, but it will not move with my hand.

[00:13:07]All right. That is off.

[00:13:11]Sort of.

[00:13:12]>> [sighs] [gasps] >> Now, I'm trying to get the other one, but of course the light's right in your way. Man. [laughter] That one.

[00:13:27]Well, maybe that one's small enough I can just push it out of the way.

[00:13:35]Doesn't seem to be.

[00:13:37]>> [laughter] >> That thing was designed to frustrate people.

[00:13:48]>> [laughter] >> Yeah, that third bolt that wouldn't ratchet anymore is still holding that pump and I can't get my hands on it.

[00:13:57]Ow.

[00:14:02]Unreal.

[00:14:08]God, that hurts.

[00:14:19]I'm not saying anything.

[00:14:22]Hold your mouth right.

[00:14:32]I can't Is it out?

[00:14:38]Okay, there's the bolt.

[00:14:56]It really seems like that ought to Oh, yeah, it's got to.

[00:15:05]>> [sighs and gasps] >> There it is.

[00:15:08]There's the pump.

[00:15:13]All right, so that's the drive side.

[00:15:15]There's a apparently a square drive up in there that is driving that. Everything on this truck is filthy.

[00:15:22]It doesn't matter how many times I wash it, it's just disgusting.

[00:15:27]I found this uh down in there, and it turns out that is a drive coupler. It's square.

[00:15:34]The uh input to the pump is square.

[00:15:37]And let's look down in this hole, and you'll see there's also another male square in there.

[00:15:45]Hopefully you all are able to see something cuz I can't see in there.

[00:15:50]I'm looking forward to seeing the footage.

[00:15:55]So, yeah, this uh this little piece of metal is basically a drive shaft. Drive shaft for a fuel pump. Don't lose that.

[00:16:03]Well, this is a bummer. Uh I talked to the folks at Area Diesel who um helped me get this pump. Using the VIN number, we both researched it and came to the same conclusion. So, of course, my truck is the oddball.

[00:16:15]But, it we got the right-hand version. Uh the handedness matters. Which way this thing spins is going to determine if it works or not. And you can see the ports are opposite, too. The big port is over on this side on this one, and it's on the left on this one. And this one's right-hand, and this one is clearly LH, left-hand. So, that pump's not going to work.

[00:16:39]But, we can still open this thing up and see what it looks like in there.

[00:16:42]The other problem is that thing bent.

[00:16:44]Maybe I can heat it up and bend it back.

[00:16:47]I don't know.

[00:17:08]It's a little gear pump in there.

[00:17:10]Yeah, I mean, I guess if the the seal here around this shaft fails, then it's going to pump fuel into the crankcase oil. This end of the shaft here is being driven basically in the crankcase.

[00:17:25]So, any fuel that comes through that goes into the crankcase. Not really what I was expecting. Yeah, the internet told me this was a diaphragm pump. The internet was wrong. That's a first.

[00:17:36]Hopefully, you can see how not round that is. It is wider that way than it is that way.

[00:17:42]That's not camera trickery. That's cuz it was that tight when I tried to unscrew it. It actually bent the brass.

[00:17:57]It would definitely be better to use a socket on something like this, but it's not round anymore, so that won't work.

[00:18:08]Just a bit of beeswax.

[00:18:25]Hmm. Now a socket fits.

[00:18:33]So, I deliberately kind of wrenched on it back the other way, so it's relatively round now, and that brass is annealed. So, if I can get it to start threading in, it'll probably be fine.

[00:18:45]Yeah, so it just needs to seal against that taper at the bottom there, and as long as it gets good compression, it will not leak. Stuff like that, it's not that I really care about replacing it.

[00:18:56]It's finding what to replace it with and getting the part in my hand. So, if I can just use this, I will. This is a 1/2 20 little thread checker, and I took this up onto the thing that this threaded into, the fuel line, and this threaded on to it just fine.

[00:19:14]So, I know that that is supposed to be a 1/2-20 thread.

[00:19:20]But, of course, it it won't really thread in.

[00:19:23]It tries to start right there, but it won't do it. So, this is a 1/2-20 bolt. Long as I can get it started straight, I'm betting you we can just thread it in.

[00:19:39]I don't really want to use a tap and cut it. I want it to bend back to the way it's supposed to be, you know?

[00:19:48]But, that isn't going to happen.

[00:19:50]All right. 1/2-20 tap.

[00:20:00]Boy, even that's stripping out.

[00:20:03]I think this thing's toast. That's a bummer.

[00:20:06]All right.

[00:20:08]Yeah, see, that side looks more like a pipe thread. Yeah, I'm going to need a new one of these, but that is a 1/4-in pipe thread to a 1/2-20 with a flare.

[00:20:17]So, I'm betting you well, hm, I won't say anything. Let me go look around and see what I can find. New pump is on the way. In the meantime, I'm going to go ahead and change out this engine oil.

[00:20:28]There's the drain plug right there. It drains directly onto this crossmember, and there's like no real way to avoid it. Yeah.

[00:20:37]Oh, well.

[00:20:38]Let's make a mess.

[00:20:51]Yeah, look how thin that is. That's horrible.

[00:20:57]We could probably just put it back in the fuel tank and burn it.

[00:21:02]Wow, I must say, I'd I've checking the dipstick, and it seemed more like oil.

[00:21:08]That's crazy.

[00:21:11]Uh I'm surprised the engine was running on that.

[00:21:20]And now I'm going to do something I've never done before. These are the engine oil filters. There's two of them. And they don't have that many miles on them.

[00:21:28]The filters aren't that bad. And for this old beater, I'm just going to take them off, dump them out to get that oil out of there.

[00:21:35]And put them back on. Why buy new filters? That's not the problem.

[00:21:55]It just seems wrong sticking them back on there like that, but All right, I really hate leaving an engine with no oil in it.

[00:22:03]Cuz some idiot will forget and run the darn thing without it. It's not a great engine, but uh I don't want to do that to it.

[00:22:19]Putting Rotella T4 in it. Compared to being lubricated with straight diesel, >> [laughter] >> that's a big step up.

[00:22:36]I'm above four.

[00:22:38]But obviously those filters are going to need to fill up.

[00:22:42]Can't run it till we get a fuel pump.

[00:22:47]There we go. Yeah, I got up with Area Diesel and they got this to me fast.

[00:22:51]Left hand, that's what I need. Okay, so the old pump was in there like this. And these two were plugged.

[00:23:00]So this guy So these two need to be plugged.

[00:23:11]This guy here is the little drive shaft.

[00:23:14]And if you're wondering, sourcing these old parts sometimes gets a little pricey. 200 bucks. Shoot. I mean, that's like a real pump. It doesn't really surprise me that it's 200 bucks. That almost seems reasonable. It's a gear pump, you know. And I got a new adapter.

[00:23:31]That was actually easy.

[00:23:32]They had it in stock at NAPA.

[00:23:35]And we're using the yellow variety of Teflon tape on this.

[00:23:42]The yellow stuff is petroleum compatible.

[00:23:51]Now, that's how I took it off, so that's how I'm going to put it back on.

[00:23:55]And we'll keep that on there until I'm really close to hooking up that fuel line. All right.

[00:24:01]So, the first thing I'm going to try to do is get this drive shaft on.

[00:24:05]Up inside there, there's no way I can film that really.

[00:24:10]But actually, it just goes right on. I'm feeling what position it's in so that I can put the pump pretty much in that position. So, I've got the pump turned so that that square feels like it's in line with the square that I just put in there, if that makes any sense.

[00:24:34]Yeah. I can't see anything, so you guys are not alone.

[00:24:38]I am trying to get this little plastic cover off.

[00:24:44]Working the pump into position on that fuel line on that side. Now, I'm hoping it will mate up with that square, and I'll feel it.

[00:24:55]I mean, it went right in, and it seems to be in the right spot.

[00:24:59]How would you know?

[00:25:00]I don't think that would go on there so easy if that wasn't lined up. Yeah, it would be hitting.

[00:25:07]So, I want to get some bolts in the pump now.

[00:25:09]Here's the best look I can give you, but I can't be working on it while the camera is in this position. Yeah, there you can see two of the bolt holes that I'm going to just be putting bolts in.

[00:25:20]And hopefully they won't fight me too much.

[00:25:29]Yeah.

[00:25:31]So, I am standing in the wheel well, leaning over these support members.

[00:25:37]Can't take them off cuz they're supporting the radiator and the hood hanging out there.

[00:25:41]And we're way way way down in there.

[00:25:49]Hardest fuel pump replacement I've ever come across. Good grief.

[00:25:54]Well, guess what I just realized?

[00:25:57]Because I can't even see the mating surface. At least that's my excuse.

[00:26:03]I totally forgot about the gasket.

[00:26:09]This one right here.

[00:26:13]It's stuck on there.

[00:26:16]Yeah, that's going to be fun.

[00:26:26]Okay.

[00:26:27]>> [clears throat] >> I don't know if you guys can see a darn thing. I'm just feeling it to see if I feel any like stuck pieces. It feels like a good clean mating surface.

[00:26:37]Y'all tell me, how's that look?

[00:26:40]That looks pretty good.

[00:26:48]Lining up the fuel line.

[00:26:53]And trying to hold the gasket in place.

[00:26:59]And it doesn't want to go in now.

[00:27:03]Come on, man.

[00:27:05]You went right in before.

[00:27:10]Oh, that's really lovely.

[00:27:12]All right, I'm worried I'm going to mess that gasket up.

[00:27:19]Why did it go right in the first time and now it won't?

[00:27:26]How am I going to do that?

[00:27:39]Come on, man.

[00:27:46]It's It's about impossible. I'm trying to line up three things at once.

[00:27:51]The drive shaft, the gasket, and the fuel hose.

[00:27:55]So, I'm going to go glue this gasket to the pump.

[00:27:58]So, I'm going to use this aviation gasket stuff. This doesn't really glue it down. It's non-hardening.

[00:28:06]But, uh with that locating ring there, I just need it to stay close.

[00:28:11]I'd be able to reach around and pivot it a little bit if I need to, but I think this will keep it there so it's not coming off.

[00:28:18]Yeah, I think that'll work fine.

[00:28:28]I'm going to let that set up for a minute and then we'll stick them together. While we're letting that set up, let me tell you what's been going on around here lately. Yeah, this is what everyone wants to hear, a farmer griping about the weather. But, uh I'd say this has been the most impactful drought I've ever had. I've never had a spring drought before. This drought started at the beginning of April. We've had a couple little rains, but nothing nothing of significance. And it is May 21st.

[00:28:54]Where I live, we typically get almost an inch of rain per week. That would be somewhere around 22 mm a week.

[00:29:01]And um we've gotten maybe an inch and a half since the beginning of April. So, in like 7 weeks.

[00:29:09]The reason it matters is because my cows are really actually running out of stuff to eat.

[00:29:14]These out here are our hay fields and there's hardly anything on them. Like this time of year, a lot of times you're cutting hay. There's no reason to cut that. I know it looks like there's grass out there on camera, but there's there's really you know, there's some seed heads sticking up.

[00:29:29]But there's no grass.

[00:29:30]This is the stuff they eat down there.

[00:29:32]You can see how dried up everything is. It's amazing that it's not more brown than it is, but it it should be green and lush this time of year, not brown and brittle. I mean, the stuff is it's crunchy when you walk through it.

[00:29:47]Yeah, it's actually kind of stressful because I've got 24 cattle right now.

[00:29:51]And I've been rotating them around on their grazing fields and [snorts] there's hardly anything left.

[00:29:57]But we have rain on the way. It's supposed to start raining here in a couple hours.

[00:30:02]And over the next 5 days, supposedly we're going to get like 3 in of rain.

[00:30:05]That would be 75 mm.

[00:30:09]So, we'll see.

[00:30:10]Farmers, they sit around and gripe about the weather.

[00:30:14]Cuz that's what they do. But it's legit, man. I got to feed those cattle and if the grass isn't growing, I got nothing to feed them. And I'm going to have to sell a bunch of them.

[00:30:23]Like really, we're to the point that if this rain doesn't come through and cause a flush of grass growth, I'm going to have to do something.

[00:30:31]Let's get back to work.

[00:30:42]And see, that'll that'll stay on there pretty well while I'm manipulating it and if I just need to move it side to side a little bit, not a big deal.

[00:31:12]Got lucky that first time. Now the drive shaft won't mesh.

[00:31:18]Come on.

[00:31:20]There you are.

[00:31:22]I'm going to stay there.

[00:31:36]I'm doing this 100% by feel and hold my mouth right.

[00:31:41]Got it [clears throat] started.

[00:31:49]So, there's just no way I'm going to be able to show you what I'm doing here.

[00:31:54]So, I actually just got that one screwed on.

[00:32:03]So, I've got one more bolt and I'm going to try it from the other side.

[00:32:09]I'm going to see how that goes.

[00:32:12]This is the tough one. It's the bolt that took me forever to get out. Now I'm trying to get it back in.

[00:32:20]Ow.

[00:32:23]Dropped it.

[00:32:25]Yeah, I'm going to have to go get a magnet just to get it back.

[00:32:28]>> [clears throat] >> There's no room.

[00:32:40]Got it in the hole.

[00:32:43]That's what she said.

[00:32:45]>> [laughter] >> That's a start.

[00:32:51]That's also what she said.

[00:32:54]It's actually going in.

[00:32:58]Oh, man, that really hurts.

[00:33:01]Got my hand jammed onto this fuel line, hard line.

[00:33:08]And it doesn't feel good.

[00:33:12]It's in.

[00:33:13]>> [sighs and gasps] >> All right.

[00:33:14]Now, can I actually tighten it?

[00:33:29]Starting to tighten up.

[00:33:41]So, somebody gave me this curved set of wrenches a long time ago, and I actually have used them a couple times, but I don't think on video.

[00:33:49]Um See if this will help me here.

[00:34:00]It won't ratchet. So, that I get on there, and I get a tiny little bit of advancement, and then I have to come off again.

[00:34:10]Pull on the wrench while you're trying to ratchet it.

[00:34:13]That's helping some.

[00:34:15]It keeps popping off of there.

[00:34:18]But, uh yeah, thank you to whoever sent me these wrenches. Sorry, I've forgotten.

[00:34:23]But, uh it is definitely helping with this very difficult bolt.

[00:34:30]Okay, that's pretty pretty good. As good I can get it with that wrench.

[00:34:34]See if I can just get the final tightening.

[00:34:38]I got to get the click.

[00:34:41]Yeah, I'm going to reach down in there with a torque wrench and torque these to spec, you know?

[00:34:46]Like that's possible.

[00:34:51]Ah, click.

[00:34:53]That one's good.

[00:34:54]>> [sighs] >> Click. That one's good.

[00:35:04]Ah, click.

[00:35:06]Okay, pump is on.

[00:35:09]Now I just got to hook up the fuel lines. Now I hear the first few raindrops hitting the roof.

[00:35:16]Come on, don't be shy.

[00:35:33]Okay, now I got to get that fitting on there. I got to take that piece of plastic off first.

[00:35:48]Coca-Cola ice pick.

[00:35:53]That'll do her.

[00:36:05]Ah.

[00:36:08]Ah.

[00:36:34]>> I'm going to start out backwards so the threads line up.

[00:36:43]There we go.

[00:36:53]Now I get to do that again.

[00:36:59]All right, you guys are kind of in the way. I'll see you back in a minute. So it actually took a while to get that one. It just didn't want to thread in. I had to get a pry bar back behind the line to push it push it that way and then with a wrench cuz it's too hard to turn by hand. If I could have turned it by hand, I could have just reached down and done it, but of course that wasn't going to happen.

[00:37:20]It's about time.

[00:38:02]So yeah, there was enough rust in there and loose stuff that kind of concerns me cuz it's really close to getting into the the actual filtered air. There's even some rust on the inside of where the filter seals.

[00:38:15]And then you get a piece of rust going right through your engine. I know this is an old beater, but this is kind of low-hanging fruit. So I'm going to go ahead and it's quitting time. I wouldn't do this otherwise, quite honestly, but I'm going to go ahead and Ospho this. This is phosphoric acid which converts rust, iron oxide, into iron phosphate.

[00:38:34]And iron phosphate does not rust and is also stable. It It doesn't uh cause problems like rust.

[00:38:41]And you can paint over it.

[00:38:44]I'm not worried about what it looks like. I just want to try to keep the rust from going through the engine. I hear that's not good for cylinders.

[00:38:54]All right, quitting time.

[00:38:57]We'll see you back tomorrow.

[00:39:08]All right, I'm not going for looks, obviously. This just some old paint I have laying around, just to get something on there.

[00:39:14]Getting ready to put this uh this air cleaner housing and filter and everything in.

[00:39:20]And I realize the best chance I have to get this thing to run is to actually bleed to that pump. Uh the pump, obviously, is generating the flow, so the the larger one, the one that way, is the input to the pump. So, that's coming from the fuel tank.

[00:39:37]And then the output from the pump is the smaller one here. I'm thinking what I should do is disconnect that and crank the engine. That way I can try to at least bleed the fuel to that point. And it would also allow me to crank the engine without it running, hopefully. I don't think it'll run right away, to distribute that new oil instead of the diesel fuel that was in there lubricating everything before I actually start this back up.

[00:40:02]All right, I've got that one backed off.

[00:40:05]If I crank it, it should start spitting fuel out of there and not start.

[00:40:10]Let's get that off of there. You know, really, I actually don't want it to start, so I don't care if it gets air or not right now. Let's leave that on there.

[00:40:22]Yeah, it started right up and I turned the key off. Well, it started and started pumping fuel right away, didn't it?

[00:40:29]That's crazy.

[00:40:33]Had to turn the key off again.

[00:40:35]>> [laughter] >> Well, I'm kind of happy to see that.

[00:40:38]That is why I'm working on this engine.

[00:40:42]Because it has always been the most faithful starting engine. I have the air plugged off and the fuel pump disconnected and it still runs.

[00:40:54]I'd say that's uh that's worth a little work.

[00:40:59]Good job, girl.

[00:41:00]So, I would really rather this thing did not run.

[00:41:03]I'm going to unplug this, which is the wire to the fuel shutoff solenoid.

[00:41:09]Except like most electrical plugs, it doesn't want to unplug.

[00:41:26]Okay.

[00:41:27]Perfect.

[00:41:33]All right.

[00:42:10]I think there's a good chance that I just did all that for nothing.

[00:42:15]Let me show you what I'm talking about.

[00:42:17]While I was putting the new pump in, I've been thinking about this pump and trying to determine if it was really the cause of diesel fuel getting in the oil.

[00:42:24]Rather than finding the smoking gun that I wanted in this pump, I think what I found is that I got bad information.

[00:42:32]There is almost no way that this pump is going to be putting diesel fuel into the crankcase.

[00:42:39]And I'll show you why. The pump sits in there like that, so this is up.

[00:42:43]This is down.

[00:42:45]That is an open weep hole.

[00:42:47]And there's a seal right here that is holding the crankcase oil onto this side.

[00:42:54]But there's also, and I'll try to show you this on camera, but there's a seal right there that is holding the fuel onto that side.

[00:43:04]And because that's down, if either seal fails, it's just going to leak out. It's not going to get into the other chamber.

[00:43:11]The crankcase oil is not going to get into the fuel, the fuel is not going to get into the crankcase. There's no evidence of any leaking in there. That actually looks pretty good. So I don't think I did that for any purpose. Oh, that's painful. So I hope you guys can see.

[00:43:31]Very difficult to film, but right in there is another seal.

[00:43:35]Here I'm I'm going that way. I'm hitting this seal. So this is the oil seal.

[00:43:41]This is the fuel seal.

[00:43:44]Seals everywhere. Just how I like it.

[00:43:47]It's actually a very uh very clever design. Even if the seals fail, it's going to alert you because it's leaking, but it's not going to uh contaminate the other gallery.

[00:44:00]So how many of you out there were yelling at the screen telling me that that pump was not the problem? I'm sure a bunch of you already knew that. So now what do we do?

[00:44:07]All right, check this out. I've been letting this thing idle for a little while. I've got an infrared thermometer.

[00:44:13]So, this is cylinder two.

[00:44:17]122°.

[00:44:19]Four is 115.

[00:44:24]Six is 127.

[00:44:27]And eight is 119.

[00:44:33]119.

[00:44:34]So, those are all roughly symmetric.

[00:44:42]So, this is cylinder one.

[00:44:45]104. A lot less.

[00:44:47]Cylinder three 80.

[00:44:57]Cylinder five nothing.

[00:45:02]55°.

[00:45:04]It's like it's not contributing at all.

[00:45:08]And cylinder seven 80.

[00:45:12]So, yeah. This entire bank is not contributing as much.

[00:45:17]Cylinder one's doing the best.

[00:45:20]Two uh one it's one, three, five, and seven.

[00:45:24]Three and seven are doing something, but not much. Five doesn't seem like it's doing anything at all.

[00:45:31]I'm right on the the exhaust port.

[00:45:34]It's 57°.

[00:45:36]Means I can reach in there and touch that, even though this thing's been running for a while.

[00:45:40]I should load it up harder and see if that makes any difference.

[00:46:02]All right, I just let it run for a couple minutes.

[00:46:10]147 145 50 150. So, those all look pretty good.

[00:46:35]140 100 This is the worst one.

[00:46:49]75 65 crazy That was a good job.

[00:47:06]30 140. So, this bank still not as good, but one and seven look better.

[00:47:17]three Yeah, I'm still only getting like 115 hard to point it 120 there Yeah, I'm right on that. I'm in the right spot.

[00:47:51]That cylinder is doing nothing.

[00:47:54]Yeah, so one and seven weren't too bad.

[00:47:57]Three was not doing great, but it was doing something.

[00:48:02]Five was doing basically nothing.

[00:48:05]That's crazy.

[00:48:06]This whole bank was actually pretty symmetric and seemed to be doing okay.

[00:48:11]Yeah, I mean, that's the way it goes.

[00:48:13]You take the fuel pump off. I mean, there's no way I could have checked that or known that. Yeah, that's not really true. Now that I know how it works, all I needed to do was stick a borescope down there and look at the weep hole.

[00:48:23]Make sure it wasn't plugged and see if there was any leakage coming out of it.

[00:48:27]Now we know it's got a new pump on there, but the old pump was not the problem. There's just no way that thing was putting fuel into the crankcase oil.

[00:48:35]Certainly not in any quantity. I don't think any at all. So, that leaves the injectors. And this is the 8.2 Detroit Diesel. This thing has kind of funky injectors.

[00:48:47]They're uh what's called a unit injector. The camshaft actually pushes a plunger on the injector itself, which is a a high-pressure pump.

[00:48:54]And it pumps the fuel. It also meters the fuel, and it also does the timing all in one unit. And there's eight of them.

[00:49:02]And they're all put in, and they have to be adjusted just so, and it can be kind of I've never done it. It can be kind of finicky, I hear. They sold special tools just for this purpose that I don't have, and they're pretty hard to come by. But what am I going to do?

[00:49:16]I mean, I think she's kind of showed that she's not ready to die yet. I mean, this thing really likes to run.

[00:49:23]I can uh disconnect the fuel pump and plug the intake with a rag, and it'll still start. [laughter] It does not want to die.

[00:49:32]Um I didn't >> [clears throat] >> really have to do any bleeding after putting the fuel pump in. Against my better judgment, I think I'm going in. I am going to try to work on these injectors, and hopefully uh I will be successful. There is definitely a chance that it will never run again.

[00:49:48]>> [laughter] >> Because uh yeah, I don't know. I've I've heard horror stories about these things and uh this this could be a tricky one.

[00:49:56]It's really interesting that I'm getting such varied exhaust temperature differences. So, the different cylinders are doing very different things and that's likely from those injectors.

[00:50:04]Uh I would suspect that cylinder five that's doing basically nothing probably has a bad injector and maybe it's not injecting any fuel at all.

[00:50:12]The reality is if I don't fix this problem and get actual lubricating oil in the crankcase, this engine is going to die very soon. And the perk is if I get these injectors right, this engine might actually have more power than I thought it did. Uh cuz it's it's a pretty weak engine. I could use every little little bit I could squeeze out of her. Uh it seems that whole left bank is not doing as well and shoot, two of the cylinders over there are hardly doing anything. Yeah, I mean, I might actually notice a difference if I get this fixed up right.

[00:50:41]Plus, I like a challenge. Uh this one's got me a little worried. All right, I'll quit yakking.

[00:50:47]Uh yeah, I think I'm going to go on with this. Um I don't know what I'm getting myself into, but we're going to give it a try.

[00:50:53]Thanks for watching. We'll see you on the next one.

[00:50:56]So, as of editing this, we've gotten about 2 in of rain, about 50 mm. Thank goodness. That'll definitely grow some grass. Hopefully, we'll not have any extended dry spells for a while.